Materials
Resin
Also known as: resina · resin · fotopolimero · fotopolímero · resina 405nm · resina uv
Short definition
3D printing resin is a photopolymer liquid that solidifies when it receives ultraviolet light, normally at a 405 nanometre wavelength.
Full definition
It consists of monomers and oligomers, photoinitiators that trigger the reaction when hit by light, and additives that adjust colour, viscosity and final properties. Typical densities for consumer formulations run from 1.05 to 1.25 g/cm³. Liquid resin is an irritant and a sensitiser: it requires nitrile gloves, safety glasses and ventilation, and neither it nor the alcohol used to wash parts may go down the drain. Prusa puts it bluntly: resin bottles, empty or full, do not go in ordinary rubbish.
Related terms
- MSLAMSLA is the resin printing technology that uses an LCD screen as a mask to cure an entire layer at once with ultraviolet light.
- SLASLA is the resin printing technology that traces each layer with a focused ultraviolet laser point by point, instead of projecting the whole layer at once.
- CuringCuring is the reaction by which liquid resin solidifies when it receives ultraviolet light, both during printing and in the finishing step afterwards.
- Post-curingPost-curing is the final ultraviolet exposure a resin part receives after washing, and it is what leaves it hard and no longer tacky.
Materials
Updated
Sources
- [1]Resins | Prusa Knowledge BasePrusa Research · Manufacturer · accessed July 27, 2026